Tock: Use Tock's libgcc

The Tock specific version of libgcc is built to be position independent,
so use that instead of the one supplied by the compiler. This fixes a
few odd corner cases when using printf().

Signed-off-by: Alistair Francis <alistair@alistair23.me>

examples/NonArduino/Tock/CMakeLists.txt

@@ -45,8 +45,8 @@ add_executable(${PROJECT_NAME} main.cpp)
 # link with RadioLib and libtock-c
 target_link_libraries(${PROJECT_NAME} PUBLIC
     RadioLib
-    gcc
     ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/libtock/build/cortex-m4/libtock.a
+    ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/libc++/cortex-m/libgcc.a
     ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/libc++/cortex-m/libstdc++.a
     ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/newlib/cortex-m/v7-m/libc.a
     ${CMAKE_CURRENT_SOURCE_DIR}/libtock-c/newlib/cortex-m/v7-m/libm.a